1156640256 has 160 divisors (see below), whose sum is σ = 3535488000. Its totient is φ = 372971520.

The previous prime is 1156640227. The next prime is 1156640269. The reversal of 1156640256 is 6520466511.

1156640256 is a `hidden beast` number, since 1 + 1 + 5 + 6 + 640 + 2 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1156640256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427195 + ... + 429893.

It is an arithmetic number, because the mean of its divisors is an integer number (22096800).

Almost surely, 2^1156640256 is an apocalyptic number.

1156640256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1156640256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1767744000).

1156640256 is an abundant number, since it is smaller than the sum of its proper divisors (2378847744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1156640256 is an equidigital number, since it uses as much as digits as its factorization.

1156640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757 (or 2735 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1156640256 is about 34009.4142260639. The cubic root of 1156640256 is about 1049.7021849254.

The spelling of 1156640256 in words is "one billion, one hundred fifty-six million, six hundred forty thousand, two hundred fifty-six".